# If      then the value of Option 1) 5 Option 2) 3 Option 3) -5 Option 4) -3

As we learnt in

Vector Product of two vectors(cross product) -

If  and  are two vectors and  is the angle between them , then

- wherein

is unit vector perpendicular to both

Scalar Triple Product -

- wherein

Scalar Triple Product of three vectors .

STP

We saw

So value = -5

Option 1)

5

This option is incorrect.

Option 2)

3

This option is incorrect.

Option 3)

-5

This option is correct.

Option 4)

-3

This option is incorrect.

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